What is Siri

Siri is an intelligent personal assistant and knowledge navigator which works as an application for Apple’s iOS. The application uses a natural language user interface to answer questions, make recommendations, and perform actions by delegating requests to a set of Web services. Apple claims that the software adapts to the user’s individual preferences over time and personalizes results, and performing tasks such as finding recommendations for nearby restaurants, or getting directions.
Siri was originally introduced as an iOS application available in the App Store by Siri, Inc., which was acquired by Apple on April 28, 2010.Siri, Inc. had announced that their software would be available for BlackBerry and for Android-powered phones, but all development efforts for non-Apple platforms were cancelled after the acquisition by Apple.
Siri has been an integral part of iOS since iOS 5 and was first supported on the iPhone 4S. Siri is supported on the iPad (3rd generation), the new iPhone 5 and iPod Touch (5th generation) in September 2012 with the release of iOS 6. Siri is not supported on iPhone 4 and earlier versions, even in iOS 6.